1 /* $OpenBSD: memrchr.c,v 1.2 2007/11/27 16:22:12 martynas Exp $ */ 2 3 /* 4 * Copyright (c) 2007 Todd C. Miller <Todd.Miller@courtesan.com> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include <string.h> 20 21 /* 22 * Reverse memchr() 23 * Find the last occurrence of 'c' in the buffer 's' of size 'n'. 24 */ 25 void * 26 memrchr(const void *s, int c, size_t n) 27 { 28 const unsigned char *cp; 29 30 if (n != 0) { 31 cp = (unsigned char *)s + n; 32 do { 33 if (*(--cp) == (unsigned char)c) 34 return((void *)cp); 35 } while (--n != 0); 36 } 37 return(NULL); 38 } 39